— 3-4 —
Inertia of a dummy load shall be approximately 20% of the load moment of inertia.
When a speed reducer mechanism is used, it shall be
GD
2
1
/(r
2
× GD
2
d
) ≤ 5
Where GD
2
1
= inertia of indirectly connected load, GD
2
d
= inertia of directly attached
load, and r = reduction ratio.)
Fig 3-4: Example of dummy load
Dummy load
Megatorque
Motor
Load
3.2.2. Installation of Driver Unit
The EDC Driver Unit must be fixed so that fins are in the vertical position for natural
air-cooling.
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Caution : (1) Ambient temperature
Ambient temperatures should be in a range from 0 to 50 [[°C]]. The
Driver Unit cannot be used in excess of 50 [[°C]]. A sufficient space
of at least 100 [mm] should be provided both above and below the
Driver Unit in a control cabinet. Operate the Driver Unit in an
environment in which internally generated heat can be dissipated. If
heat is trapped above the Driver Unit, open the space above it to
allow for the heat to dissipate (in this case, also take steps to
prevent the entry of dust) or provide a forced air cooling system.
(2) Dust-proof • Waterproof
◊ Use the Driver Unit in a control cabinet with IP54 or higher. Protect
the Driver Unit from exposure to oil mist, cutting water, cutting dust,
coating gas, etc., to prevent their entry into the Driver Unit through
ventilation openings, which may cause circuit failure.
◊ IP code is specified in the IEC standard and classifies the
protection level of enclosures from the solid contaminant and
water.
◊ Explanation of IP54:
• Code 5: Dust-proof (protection against external solid contaminant)
• Code 4: Waterproof (must not be affected by water splash in any
direction.)
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Caution : When installing two or more Driver Units for multi-axis combinations,
provide a 10 mm or more space between adjacent Driver Units.
Maintain inside temperature of the enclosure into which the Driver Unit is installed between 0 to
50[°C]. If the alarm P0 (Over heat) occurs frequently, provide a forced cooling to the heatsink.
Refer to “11. Alarm and Warning” for details.
The Driver Unit can be attached to a panel using front mounting brackets (optional).
The maximum power loss of the EDC Driver Unit is 55 W.
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